Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6ac327d738c67fd…

MALICIOUS

PDF

78.5 KB Created: 2021-04-03 15:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 80a60329b2ad9d6d9afc964e686db5e5 SHA-1: e0fdf8e9ee244fa5525634fb56f2eee066d27511 SHA-256: a6ac327d738c67fd8233c1bc2c501853365d91868b71f40a2b5c4a1621c4d37a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to disposable hosting services, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristics point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://resalured.ru/award?keyword=wordly+wise+3000+book+7+pdf+download PDF link annotation
    • https://cdn.sqhk.co/letarezetap/CvgiczF/ragaduwojak.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/ihwjgjf/strawberry_lemonade_bubble_tea_calories.pdfIn PDF document text
    • https://cdn.sqhk.co/pasivuzuke/02MEicg/nomuvewejigobuxifikuwirel.pdfIn PDF document text
    • http://sibepizibatiza.iblogger.org/how_many_claims_in_a_patent.pdfIn PDF document text
    • http://vetapako.22web.org/45217254074.pdfIn PDF document text
    • https://cdn.sqhk.co/nemazuwigumo/cF5iahe/lowaj.pdfIn PDF document text
    • http://dejonuv.22web.org/vernier_caliper_calibration_certificate.pdfIn PDF document text
    • https://cdn.sqhk.co/nozelezinofa/hpheJii/wakopupe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382949/normal_6020530868c46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412403/normal_6027f05acc6fe.pdfIn PDF document text
    • https://kikuramem.weebly.com/uploads/1/3/2/7/132740701/9618280.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493221/normal_6047a615d719c.pdfIn PDF document text
    • https://letotanuvimipe.weebly.com/uploads/1/3/4/5/134598603/xujabokedogu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412768/normal_6013c69f21b3c.pdfIn PDF document text
    • https://cdn.sqhk.co/pelopuxi/WzWBia6/adobe_premiere_pro_cc_luts_free.pdfIn PDF document text
    • https://cdn.sqhk.co/pulizojiwim/wrU2hcs/free_ringtones_for_my_phone.pdfIn PDF document text
    • https://jipuzalo.weebly.com/uploads/1/3/4/6/134693454/2108509.pdfIn PDF document text
    • https://cdn.sqhk.co/tuturuno/ygigjze/maze_runner_scorch_trials.pdfIn PDF document text
    • https://ziperivowupidu.weebly.com/uploads/1/3/1/3/131381589/a737cbb2d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477400/normal_5ff75d6b1de48.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406202/normal_5fe5e4eaa1966.pdfIn PDF document text
    • https://cdn.sqhk.co/tatonabufule/jbiichf/jonejunapugolodoji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puzazusor.rf.gd/budget_highlights_2020.pdfIn PDF document text
    • http://bakowap.epizy.com/basofil_adalah.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5B 5832 bytes
SHA-256: 5896905eca30c3e7427d7589fe4464577315212580560c39c1117812271ccf1c
font_01_sfnt_off00010362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10362 12032 bytes
SHA-256: 91ae6b110ce793c8e8a5396e66692fce08c11273837a8e6bef3b0b3d95e0e1de